Version is 11.2

I forgot to mention, you need to switch your theme to Classic or Windows 7 Basic. The intermediate display looks like the checkbox is disabled.

Hello,

I am not able to reproduce this at all. Could you please try to attach if possible a small sample project reproducing the above mentioned issue, I will be happy to take a look at it?

Hello,

I am checking about the progress of this issue. Please let me know If you need any further assistance on this.

If the checkbox style (using AppStylist) of the grid is unset, the header checkbox is not rendered correctly. If I specifically select a predefined style (like Office2007), the header checkbox is rendered consistent with the checkbox that appears within a row. 

Hello,

The following is a screenshot from my application:

Could you please try to attach if possible a small sample project reproducing the above mentioned issue, I will be happy to take a look at it?

I still have the same problem. Here is how the AppStylist looks when using Windows Classic OS theme.

Hi,

Thank you for your feedback. Please feel free to let me know if a question about our tool set comes up on your mind.

I'm going to revisit it again when I start working on the control. We still don't know what to do with UltraCombo, but we just ended up using a floating standalone checkbox for the UltraGrid's header checkbox since the column is in a fix location.

Hello,

I am still following this thread. Do you need any assistance?

I am not sure if we are on the same page here. If you are loading the style once, why would you want an event for that action? You can put the code just after loading the style.

I'm not sure how will that work. The ISL file is loaded once at the startup of my application.