How to change theme in silverlight at runtime

[Jaroslav Půbal]

I really search this forum and documentation long time and nothing found. :-(

Is it possible in silverlight for telerik components ?

[Jaroslav Půbal]

I found this
http://blogs.telerik.com/blogs/posts/10-03-17/changing_silverlight_application_themes_at_runtime.aspx

[Jaroslav Půbal]

Is there better way for repaint complete visual tree ?
The way described in link above is possibly destrutive to references if using "Prism regions" or MEF.

[Valeri Hristov]

Hello Jaroslav,

The so called application themes replace the default styles of the controls in Generic.xaml. When you change the application theme, the controls do not update their default styles, hence you need to recreate the whole visual tree.

Instead of setting application theme you could use the telerik:StyleManager.Theme attached property on every Telerik control (and most of the standard Silverlight controls) to specify a theme. I suppose that the best would be to provide a Theme property in your view models and bind the attached property to the Theme property - when the Theme is changed, the attached property will update all controls.

Best wishes,
Valeri Hristov
the Telerik team

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[vm0411]

I tried the method you described, which I nicked from the sample called "RuntimeThemeChange" somewhere on this forum.
So it goes like :

<TextBlock telerik:StyleManager.Theme="{Binding CurrentTheme.Theme}">My Text Box:</TextBlock>

Works OK


I need to add some controls (RadioButtons) in the code-behind as:

RadioButton myRadioButton = new RadioButton();
//need some theme binding here
this.MyPanel.Children.Add(myRadioButton);

How to bind the theme is this case?

[Valeri Hristov]

You can use something like:

var radioButton = new RadioButton();
radioButton.SetBinding(StyleManager.Theme, new Binding("CurrentTheme.Theme"));
...
this.MyPanel.Children.Add(radioButton);

Best wishes,
Valeri Hristov
the Telerik team

[vm0411]

Thanks Valeri. Works like a charm