Change Theme Dynamically

[Rahul Gupta]

How can I change theme dynamically using RadControls.
I already visited this link:
http://www.telerik.com/community/forums/silverlight/general-discussions/how-do-i-apply-a-theme.aspx
but not able to get any solution. Selecting Theme from dropdown Combobox I want to change Theme. How can I acheive that. Till now I have not yet got a single Solution for my problem from the Telerik team. Please help me to solve this issue.

[Yavor Georgiev]

Hello Rahul Gupta,

 Please find attached a solution demonstrating how to change the theme of a telerik control from a ComboBox.

Regards,
Yavor Georgiev
the Telerik team

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[Rahul Gupta]

Thank you Telerik Team for you Support.

[Travis]

This sample is setting the control in xaml.  How do you do it from code behind.  My scenario is that I've created a RadGridView dynamically and want to set the theme from code behind.

[Travis]

Figured it out:

StyleManager.SetTheme(MyRadControl, new Telerik.Windows.Controls.Office_SilverTheme());

 

 

 

 

 

 

 

 

[Pic Micro]

Hello, Is there way to load a theme from an URL. I'm asking that since I have done some things with Flex and that's one of the things I missed from Flex.

Thx

[George]

Hi Pic,

Our themes can be downloaded dynamically if this suits your needs. I am not sure I understand you question. Could you please give us more detailed information? If you tell us what is your scenario it would be very helpful. 

Regards,
George
the Telerik team

[CyclingFoodmanPA]

Hello Yavor,

Great example.  I am wondering how to change themes dynamically for an entire application.  This particular example changes the theme for the grid which is great, but how do you change the theme for an application using the RadControls.  There is an example at: http://weblogs.asp.net/lduveau/archive/2010/05/31/dynamically-apply-and-change-theme-with-the-silverlight-toolkit.aspx that allows you to change the theme for the entire application using the SL toolkit.

Could you or someone put up an example on how to do this with the telerik controls.  I think it is similar to the one above, but I am missing something and cannot get it to work.  I know I am close but I know as soon as I see the correct solution I will probably be mad at myself because I am close.

Thanks for developing great controls.

Keith

P.S. I am using the latest Silverlight RadControls (build from Q4 2010).

[Yavor Georgiev]

Hello Keith,

 The theming mechanism for our Silverlight controls suite is a bit different from the one in the Silverlight Toolkit that Microsoft provides.

 In your UserControl, create a dependency property called CurrentTheme, of type Telerik.Windows.Controls.Theme. Give it a default value of, say, a new instance of the Office_BlackTheme class.

 Then, in the XAML of your UserControl, bind the telerik:StyleManager.Theme attached property of every telerik control to the CurrentTheme property of the UserControl. If you change the value of the CurrentTheme property, all the controls that are bound to it should change as well.

 Unfortunately there is no easy or surefire way to achieve this. We are constantly looking forward to improving our theming mechanism, but keeping it backwards-compatible and consistent across our WPF and Silverlight suites is no easy task. Hopefully we will be able to implement on-the-fly changing of the current application theme in our StyleManager very soon.

Greetings,
Yavor Georgiev
the Telerik team

[John]

The above code approach works as per this video .. however the control that I am using to change the theme is a RadComboBox on the selection change event. This works except it does not update the RadComboBox so I then added a StyleManager for the RadComboBox itself, and even though it does change the Theme, I also get an null ref exception. It appears that you can't change a theme within a SelectionChanged event handler else you will throw an exception.  As a simple work-around I created a simple Timer that fires 20 milliseconds post the selection change event, and in which where I apply the newly changed Theme. This works but I do not like this approach.  Is there a better control event that I can use to set the Theme of the control that is altering the Theme?