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Scroll button only visible after window resizing

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TabControl
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Jose Simas
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Jose Simas asked on 28 May 2010, 11:03 AM
Hi,

I came across this scenario that appears to be a bug. When I bind a series of items to a RadTabControl that is not wide enough to show them the scroll buttons do not appear until I resize the window. This is the simplest way to duplicate:

XAML:

<Window x:Class="Workbench.RadTabControlTest"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
        xmlns:Controls="clr-namespace:Telerik.Windows.Controls;assembly=Telerik.Windows.Controls.Navigation" Title="RadTabControlTest" Height="400" Width="500">
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition></RowDefinition>
            <RowDefinition></RowDefinition>
        </Grid.RowDefinitions>
        
        <Button 
            Width="125"
            Height="25"
            Click="Button_Click">Set Items</Button>
        
        <Controls:RadTabControl 
            x:Name="tabs"
            Width="250"
            Height="150"
            Grid.Row="1"
            />
    </Grid>
</Window>

And the code behind:

public partial class RadTabControlTest: Window
    {
        public RadTabControlTest()
        {
            InitializeComponent();
        }

        private void Button_Click(object sender, RoutedEventArgs e)
        {
            tabs.ItemsSource = new[] {"one", "two", "three", "four", "five", "six", "seven", "eight", "nine", "ten"};
        }
    }

I am using the latest release and the project is .NET 4.0.

Am I doing something wrong?

Cheers,
Jose

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Bobi
Telerik team
answered on 02 Jun 2010, 11:42 AM
Hi Jose Simas,

All you need to do is to use the following code:
private void Button_Click(object sender, RoutedEventArgs e)
        {
            tabs.ItemsSource = new[] { "one", "two", "three", "four", "five", "six", "seven", "eight", "nine", "ten" };
            tabs.UpdateLayout();
        }
I  hope that this will help you. Please let us know if you have any other questions or need some more help.

All the best,
Bobi
the Telerik team

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Jose Simas
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Bobi
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