I'm new to Telerik Reporting and I'm trying to add a control to an existing report that will expand/collapse the group below. See attached pictures. The first one is the current report and the second one is what I'm trying to accomplish. When the check box is checked, all of the groups below would be expanded. When it's selected again, all of the groups would collapse. I've tried several things and looked around the internet for a similar case but haven't been successful. I think I can do this by creating a totally separate report with different defaults (all expanded or all collapsed) but I was wondering if it's possible to add a checkbox (or some other control) to the existing report that would accomplish the same result.