I converted the app to PB 2021 Build 1509 and it is still a problem.

Running the app from the IDE, I widen the image column and then make it smaller. A blank area appears on the right. 

I couldn't figure out how to paste in an image so I attached it. I also attached the app. It runs against 'PB Demo DB V2021' database.

Roland,  are you talking about development resizing of the grid or runtime resizing of the grid?    At runtime, if you make the column containing the bitmaps narrower they will spill over on to the next column (i.e. they are in a fixed position).  However if you make the column wider again everything ends up in the correct place.  I am not seeing the next door column getting narrower.   We are in the latest build of PB 2021

Before Resizing:

After resizing the first column very narrow:

After Resizing back again:

I tried it in PB10.5. When I make the bitmap column smaller, the header over the neighboring column on the right gets smaller. After several resizes the column is gone entirely.

We use a detail band color expression as follows:

if(getrow()=currentrow(), gf_color('CLINDEX_LIST_SELECTED_ROW'),
if(mod (Getrow(), 2) = 0, gf_color('CLINDEX_LIST_EVEN_ROW'), gf_color('CLINDEX_LIST_ODD_ROW')))

We have a global function called gf_color(<color name>) which has standard colors (e.g. ORANGE) but also has custom color names for our application so that we have standardized colors for old/even rows and selected rows. 

Very cool. What method did you use for the row background color being different?

That's pretty cool, Mark! I'm going to have to look into this. Thank you for sharing this with the Community!