Hello so I have a customized vertical tab using the drawitem. However I can’t put something in the tab control strip. I want to put a calender there so that I can utilize the free space however the tab-control doesn’t let me do that. Is there a possible way of doing that thing?
*here’s the image attached

**I want it to look like this but in a vertical format so that I can utilize the empty space in photo 1

The simplest way is to not add it to the Tab Control. Just add the control to the form, but make sure it sits on top of the Tab Control:
Simple example: