The "{" character cannot be entered in the RadComboBox when the keyboard is German (Swiss).
As a wokaround, you can inherit the RadComboBox and override the HandleKeyDown method:
public class CustomRadComboBox : RadComboBox
{
protected override bool HandleKeyDown(Key systemKey, int platformKeyCode)
{
if(systemKey == Key.Oem5)
{
return false;
}
return base.HandleKeyDown(systemKey, platformKeyCode);
}
}