First of all thanks for your reply!
The advice you gave i had already found on the Telerik website.
But still I did try this, but my issue remains the same. So I set the tresholds like this now :
|SmallToNormalThreshold="400 400" NormalToSmallThreshold="400 400"
|NormalToLargeThreshold="600 600" LargeToNormalThreshold="600 600"
But still the width AND the height must have this value in order to switch between the different contents.
Can't this be a bug? Because I think in several cases that it would be better if the width OR the height has a certain value, the content has to change.
In my case I have a piechart in the normalcontent and an entire dashboard in the largecontent. My dashboard has a minimum width of 900, so when i set the normaltolarge and the largetonormal = 900 900, i never get to see the dashboard ... Hope you understand what i try to explain!
Any help for this ?