Controls TabControl Interview Questions & FAQs

Questions and answers for Controls TabControl.

57. Controls TabControl

57.1 How do I prevent the user from changing the selected tab page in a TabControl ?

57.2 How do I dynamically hide and unhide tabs in a TabControl ?

57.3 How do I make the tabs in a TabControl appear on the bottom instead of the right?

57.4 How can I add a style to a TabItem that is used in the TabControl ?

57.1 How do I prevent the user from changing the selected tab page in a TabControl ?

You can use the TabPage's "Validating" event to prevent a new tab page selection.

The steps involved are given below.

1. Every time the user selects a new tab, make sure that the corresponding tab page gets the focus. You can do so as follows:

[C#]

														

														private void tabControl1_SelectedIndexChanged(object sender, EventArgs e)

														{

														tabControl1.TabPages[tabControl1.SelectedIndex].Focus();

														tabControl1.TabPages[tabControl1.SelectedIndex].CausesValidation = true;

														}

Note that "CausesValidation" should be set to 'True' since you will be listening to the Validating event in the next step. You will also have to add some code when the TabControl is shown the very first time (like in the Form_Load event handler).

2. Listen to the TabPage's "Validating" event (which will be called when the user clicks on a different tab page) and determine whether the user can be allowed to change the selected tab page.

[C#] using System.ComponentModel; private void tabPage1_Validating( object sender, CancelEventArgs e ) {

if ( !checkValidated.Checked ) e.Cancel = true; }

57.2 How do I dynamically hide and unhide tabs in a TabControl ?

It is a common mistake to try to use the "Visible" property of the Tab Page to make the tab invisible. But this does not work (The Visible property of the TabPage is essentially obsolete). The TabControl doesn't provide you an easy way to do so. The workaround is to remove and add the tab page from the TabControl whenever you want to hide / unhide it. Refer to "How do I programmatically insert or delete tab pages in a TabControl?" in this FAQ for more information.

57.3 How do I make the tabs in a TabControl appear on the bottom instead of the right?

Set the "TabControl.Alignment" property to 'TabAlignment.Bottom'.

[C#]

														

														tabControl1.Alignment = TabAlignment.Bottom;

You can also change the tabs into buttons using the "Appearance" property and TabAppearance enums.

57.4 How can I add a style to a TabItem that is used in the TabControl ?


														[XAML]
														
														<Style TargetType="TabItem">
														<Setter Property="BorderThickness" Value="3"/>
														<Setter Property="BorderBrush" Value="Red"/>
														<Setter Property="Background" Value="LightBlue"/>
														<Setter Property="VerticalContentAlignment" 
															Value="Center"/>
														<Setter Property="HorizontalContentAlignment" 
															Value="Center"/>
														<Setter Property="Template">
														<Setter.Value>
														<ControlTemplate TargetType="{x:Type TabItem}">
														<Border>
														<Grid>
														<Grid>
														
															



  
														<Border CornerRadius="3,3,0,0" Background="{TemplateBinding 
															Background}"
														BorderBrush="{TemplateBinding BorderBrush}"
														BorderThickness="{TemplateBinding BorderThickness}"/>
														</Grid>
														<Border BorderThickness="{TemplateBinding BorderThickness}"
														Padding="{TemplateBinding Padding}">
														<ContentPresenter ContentSource="Header"
														HorizontalAlignment="{TemplateBinding 
															HorizontalContentAlignment}"
														VerticalAlignment="{TemplateBinding 
															VerticalContentAlignment}"/>
														</Border>
														</Grid>
														</Border>
														</ControlTemplate>
														</Setter.Value>
														</Setter>
														</Style>

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Controls TabControl Interview Questions & FAQs

57. Controls TabControl

57.1 How do I prevent the user from changing the selected tab page in a TabControl ?

57.2 How do I dynamically hide and unhide tabs in a TabControl ?

57.3 How do I make the tabs in a TabControl appear on the bottom instead of the right?

57.4 How can I add a style to a TabItem that is used in the TabControl ?