Disable DropDownButton in readonly mode of the DataForm

[Björn]

I use the DateTimePicker in the EditTemplate of the DataForm:

<toolkit:DataField PropertyPath="Startdate">
    <telerikInput:RadDateTimePicker InputMode="DatePicker"
        SelectedDate="{Binding Startdate, Mode=TwoWay}" DateTimeWatermarkContent=""/>
</toolkit:DataField>

In the readonly mode of the DataForm the textbox of the DateTimePicker is disabled, BUT the DropDownButton is still enabled.
How to disable the DropDownButton?

Thanks
Björn.

[Yana]

Hi Björn,

Actually this is the default behavior of RadDateTimePicker in read-only mode -  the calendar is opened, but you cannot select a date. You could edit the ControlTemplate of RadDateTimePicker and add the binding to the DropDownButton IsReadOnly property. Please check here and here for more details.

All the best,
Yana
the Telerik team

[Björn]

Hi Yana
Sorry for the delay. It's not so clear what you mean. I made following:
1. create in Blend a copy of the style
2. set in the xaml:

<telerik:RadDropDownButton x:Name="PART_DropDownButton" IsEnabled="{TemplateBinding IsReadOnly}" 

=> that works in the opposite way
3. want to use a converter

IsEnabled="{TemplateBinding IsReadOnly, Converter={StaticResource NotOperatorValueConverter}}"

=> but that's not possible!

What's the best way to bind IsEnabled to the IsReadOnly of the control?

Thanks
Björn.

[Yana]

Hello Björn,

Please try it like this:

<telerik:RadDropDownButton x:Name="PART_DropDownButton"
IsEnabled="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=IsReadOnly, Converter={StaticResource InvertedBooleanConverter}}"
...
</telerik:RadDropDownButton>

where InvertedBooleanConverter is defined like this:

<telerik:InvertedBooleanConverter x:Key="InvertedBooleanConverter" />

Hope this helps.

Regards,
Yana
the Telerik team

[Björn]

Hi Yana
I found a solution to set the RadDateTimePicker.IsEnabled=false in the DataForm, when the DataForm is in the readonly mode.
Regards and thanks for the help
Björn.