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I create a new node in the tree, get its HTREEITEM and call this line (I have a two columns tree):

GridCellJoinSet(CSize(2,1), 0, ItemGetVisibleIndexOf(hti));

What happens is very weird - it seems that the two cells in the row that I joined are being written one on top of the other...

Note that the two cells are of the type CExtGridCellString, the left one has a text value, and the right one is empty, what I wanted was that when the left column becomes narrow, the text will flow to the right column’s cell.

I am using it in one row only (as you can see above: CSize(2,1) )

Please fix.

As we said earlier the grid cell merging is not supported in the tree grid yet. We are working on this feature. Here is the beta test:

test_cell_join_in_tree_grid(beta).zip

The same bug I reported also happens in your beta demo:

Check what happens when you drawg the left side of the column marked as ’Second column’ to the left .

Look what happens in the second and third row - you do not compute the offset of the nodes correctly.

The same happens in 2.83