RadDock does not currenly persist the state of the ToggleCommand through postbacks out of the box, yet there is a possible approach that can fulfill your requirement. You may use a hidden field to store the current state of the ToggleCommand
and then to set the toggle state and the content of the RadDock according to its value.
I have attached a sample project, implementing the suggested approach. You can use it as a basis for your further development.
In the following link you can check the PITS Issue that I logged for this feature request: Public URL
. If enough votes are accumulated we will try to implement it for one of the upcoming releases.
the Telerik team