Problem in Change a border color when telerik:RadComboBox is empty

[Shanka]

Hi
I want to  apply  a style when a RadComboBox is not selected value
I try with ComboBox its working correctly but how to apply it in to a telerik:RadComboBox
please help.

My Style

 <Style x:Key="requiredFieldValidationStyle">
            <Style.Triggers>
                <DataTrigger Binding="{Binding RelativeSource={RelativeSource Self}, Path=Text}" Value="">
                    <Setter Property="telerik:RadComboBox.BorderBrush" Value="Red" />
                    <Setter Property="telerik:RadComboBox.BorderThickness" Value="2" />
                </DataTrigger>
            </Style.Triggers>
        </Style>

Combobox

  <ComboBox Style="{StaticResource requiredFieldValidationStyle}" Margin="12,99,24.442,0" Height="24" VerticalAlignment="Top">
            <ComboBoxItem />
            <ComboBoxItem> </ComboBoxItem>
            <ComboBoxItem>1</ComboBoxItem>
            <ComboBoxItem>2</ComboBoxItem>
        </ComboBox>

RadComboBox
   <telerik:RadComboBox Style="{StaticResource requiredFieldValidationStyle}" telerik:Theming.Theme="Vista" Height="53.169" Margin="24.442,12,12,0" Width="219.558" VerticalAlignment="Top">
            
            <telerik:RadComboBoxItem Content=""/>
            <telerik:RadComboBoxItem Content="Item 1"/>
            <telerik:RadComboBoxItem Content="Item 2"/>
        </telerik:RadComboBox>



Thank you

[Shanka]

Hi,

Color is applied but mouse over its change to a default color as orange.
 Can I stop change to default color in radcombobox

thank you

[Dani]

Hi Shanka,

If you generate the template of RadComboBox in Blend and examine the template structure, you will notice that there are a few Borders inside. Only one of them however is template-bound to the BorderBrush value. So what happens is that when your DataTrigger gets triggered and the red border appears, the focus border (and consequently the mouse over border) appears on top of it.

I suggest that you take the approach demonstrated in the attached sample - add one more border in the template structure after all original borders. It  will serve the purpose of signalling when the data triggers is executed. Search for "NOTE" in the attached sample to localize the key spots.


Greetings,
Dani
the Telerik team