{"id":81,"date":"2007-09-13T04:02:37","date_gmt":"2007-09-13T09:02:37","guid":{"rendered":"http:\/\/mariusbancila.ro\/blog\/?p=81"},"modified":"2010-07-04T12:33:34","modified_gmt":"2010-07-04T10:33:34","slug":"wpf-tab-control","status":"publish","type":"post","link":"https:\/\/mariusbancila.ro\/blog\/2007\/09\/13\/wpf-tab-control\/","title":{"rendered":"WPF tab control"},"content":{"rendered":"<p>A WPF TabControl contains multiple items (TabItem), just like any tab control, and adding new tabs is quite easy. The following example shows a tab control with two tab items.<\/p>\n<p><img decoding=\"async\" align=\"middle\" src=\"\/blog\/wp-content\/uploads\/2007\/09\/wpftabcontrol1.png\" alt=\"Empty tab with two items\" title=\"Empty tab with two items\" \/><\/p>\n<pre name=\"code\" class=\"xml\">\r\n<Window x:Class=\"WPFControls.Window1\" \r\n    xmlns=\"http:\/\/schemas.microsoft.com\/winfx\/2006\/xaml\/presentation\" \r\n    xmlns:x=\"http:\/\/schemas.microsoft.com\/winfx\/2006\/xaml\" \r\n    Title=\"TabControl demo\" Height=\"256\" Width=\"300\">\r\n    <Grid>\r\n\t\t<TabControl Name=\"tabControl1\">\r\n\t\t\t<TabItem Header=\"First\"><\/TabItem> \r\n\t\t\t<TabItem Header=\"Second\"> \r\n\t\t<\/TabControl> \r\n\t<\/Grid> \r\n<\/Window><\/pre>\n<p>However, when you try adding child controls to a TabItem you&#8217;ll notice that you can actually add one single child. The following XAML code yields an error.<\/p>\n<pre name=\"code\" class=\"xml\">\r\n<Window x:Class=\"WPFControls.Window1\"\r\n    xmlns=\"http:\/\/schemas.microsoft.com\/winfx\/2006\/xaml\/presentation\"\r\n    xmlns:x=\"http:\/\/schemas.microsoft.com\/winfx\/2006\/xaml\"\r\n    Title=\"TabControl demo\" Height=\"256\" Width=\"300\">\r\n    <Grid>\r\n\t<TabControl Name=\"tabControl1\">\r\n\t\t<TabItem Header=\"First\">\r\n\t\t\t<Label Height=\"23\" Margin=\"10,10,0,0\" Name=\"label1\" \r\n\t\t\t\tVerticalAlignment=\"Top\" HorizontalAlignment=\"Left\" \r\n\t\t\t\tWidth=\"66\">Name<\/Label>\r\n\t\t\t<TextBox Height=\"21\" Margin=\"88,35,12,0\" Name=\"textBox1\" \r\n\t\t\t\tVerticalAlignment=\"Top\">\r\n\t\t<\/TabItem>\r\n\t\t<TabItem Header=\"Second\">\r\n\t<\/TabControl>\r\n   <\/Grid>\r\n<\/Window>\r\n<\/pre>\n<p><cite>error MC3089: The object &#8216;TabItem&#8217; already has a child and cannot add &#8216;TextBox&#8217;. &#8216;TabItem&#8217; can accept only one child. Line 9 Position 6.<\/cite><br \/>\nThe solution however is simple: use a grid or panel (Grid, UniformGrid, StackPanel or WrapPanel) to host multiple items. In the example bellow a Grid control was used to host the label and textbox.<\/p>\n<pre name=\"code\" class=\"xml\">\r\n<Window x:Class=\"WPFControls.Window1\"\r\n    xmlns=\"http:\/\/schemas.microsoft.com\/winfx\/2006\/xaml\/presentation\"\r\n    xmlns:x=\"http:\/\/schemas.microsoft.com\/winfx\/2006\/xaml\"\r\n    Title=\"TabControl demo\" Height=\"256\" Width=\"300\">\r\n    <Grid>\r\n\t<TabControl Name=\"tabControl1\">\r\n\t\t<TabItem Header=\"First\">\r\n\t\t\t<Grid Margin=\"0,0,0,0\" Name=\"grid1\">\r\n\t\t\t\t<Label Height=\"23\" Margin=\"10,10,0,0\" Name=\"label1\" \r\n\t\t\t\t\tVerticalAlignment=\"Top\" HorizontalAlignment=\"Left\" \r\n\t\t\t\t\tWidth=\"66\">Name<\/Label>\r\n\t\t\t\t<TextBox Height=\"21\" Margin=\"80,10,10,0\" Name=\"textBox1\" \r\n\t\t\t\t\tVerticalAlignment=\"Top\">\r\n\t\t\t<\/Grid>\r\n\t\t<\/TabItem>\r\n\t\t<TabItem Header=\"Second\">\r\n\t<\/TabControl>\r\n   <\/Grid>\r\n<\/Window>\r\n<\/pre>\n<p>The result can be seen in the following image:<\/p>\n<p><img decoding=\"async\" align=\"middle\" src=\"\/blog\/wp-content\/uploads\/2007\/09\/wpftabcontrol2.png\" alt=\"Multiple items in a grid in a tab item\" title=\"Empty tab with two items\" \/><\/p>\n<p>You can create all that from code. The equivalent in C# is the following:<\/p>\n<pre name=\"code\" class=\"csharp\">\r\npublic Window1()\r\n{\r\n        InitializeComponent();\r\n\r\n        \/\/ create a new tab control\r\n        TabControl tab = new TabControl();\r\n\r\n        \/\/ create tab items and add them to the tab control\r\n        TabItem item1 = new TabItem();\r\n        item1.Header = \"First\";\r\n        tab.Items.Add(item1);\r\n\r\n        TabItem item2 = new TabItem();\r\n        item2.Header = \"Second\";\r\n        tab.Items.Add(item2);\r\n\r\n        \/\/ create a new grid to host other controls\r\n        Grid grid1 = new Grid();\r\n\r\n        \/\/ create a label and add it to the grid childred\r\n        Label label1 = new Label();\r\n        label1.Margin = new Thickness(10, 10, 0, 0);\r\n        label1.VerticalAlignment = VerticalAlignment.Top;\r\n        label1.HorizontalAlignment = HorizontalAlignment.Left;\r\n        label1.Width = 66;\r\n        label1.Content = \"Name\";\r\n        grid1.Children.Add(label1);\r\n\r\n        \/\/ create a textbox and add it to the grid childred\r\n        TextBox textBox1 = new TextBox();\r\n        textBox1.Margin = new Thickness(80, 10, 10, 0);\r\n        textBox1.VerticalAlignment = VerticalAlignment.Top;\r\n        grid1.Children.Add(textBox1);\r\n\r\n        \/\/ set the grid as the content of a tab item\r\n        item1.Content = grid1;\r\n\r\n        \/\/ add the tab control to the main grid of the window\r\n        masterGrid.Children.Add(tab);\r\n}\r\n<\/pre>\n<p>where masterGrid is the main grid in the window:<\/p>\n<pre name=\"code\" class=\"csharp\">\r\npublic partial class Window1 : \r\n     System.Windows.Window, System.Windows.Markup.IComponentConnector {\r\n        \r\n     internal System.Windows.Controls.Grid masterGrid;\r\n<\/pre>\n","protected":false},"excerpt":{"rendered":"<p>A WPF TabControl contains multiple items (TabItem), just like any tab control, and adding new tabs is quite easy. The following example shows a tab control with two tab items. However, when you try adding child controls to a TabItem you&#8217;ll notice that you can actually add one single child. The following XAML code yields &#8230; <a title=\"WPF tab control\" class=\"read-more\" href=\"https:\/\/mariusbancila.ro\/blog\/2007\/09\/13\/wpf-tab-control\/\" aria-label=\"Read more about WPF tab control\">Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_uag_custom_page_level_css":"","advgb_blocks_editor_width":"","advgb_blocks_columns_visual_guide":"","_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2},"jetpack_post_was_ever_published":false},"categories":[13,21],"tags":[],"class_list":["post-81","post","type-post","status-publish","format-standard","hentry","category-net","category-xaml"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.1.1 - aioseo.com -->\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<meta name=\"author\" content=\"Marius Bancila\"\/>\n\t<link rel=\"canonical\" href=\"https:\/\/mariusbancila.ro\/blog\/2007\/09\/13\/wpf-tab-control\/\" \/>\n\t<meta name=\"generator\" content=\"All in One SEO (AIOSEO) 5.0.1.1\" \/>\n\t\t<meta property=\"og:locale\" content=\"en_US\" \/>\n\t\t<meta property=\"og:site_name\" content=\"Marius Bancila&#039;s Blog | About code. 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The following example shows a tab control with two tab items. However, when you try adding child controls to a TabItem you&#8217;ll notice that you can actually add one single child. 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