I have a two-page (tabbed) Form. Page 1 is the edit/data entry page, and page 2 is a grid/data selection page. The form has a property to indicate that it should open on the grid page, with the grid as the selected object.

The "improper" behavior is as follows:
When the form opens, the grid is selected, and the first row is highlighted (properly).
Using the arrow keys to navigate the grid properly results in the row highlight moving to the selected row.
Using the mouse to click on a different row moves the cursor, but not the row highlight - the original row remains highlighted (although as I'm writing and alt-tabbing back and forth to my app, I see that when I go *back* to the app, the correct row is highlighted).
Navigating the grid using PageUp and PageDown produces *truly* weird results - like some of the highlight moves, but not all of it; if I'm at the bottom of the visible portion of the grid and page down the contents of the selected row/column changes, but no other data refreshes.

If I click on the Edit page, then back to the grid, all the above weirdness goes away, and the highlighting and page navigation all work as expected.

The highlighting of the grid (which is a class), is done with the following code in the AfterRowColChange event (which I think I got in FPA):
LPARAMETERS nColIndex
THIS.nCurrRec = RECNO(THIS.RecordSource)
THIS.SetAll("DynamicBackColor","IIF( RECNO() = THIS.nCurrRec, RGB(255,255,0), ;
RGB(255,255,255))","column")
THIS.Refresh()

I can't think of any property values that might be changing values when the Edit page is selected.

I'll be happy to post additional code, but don't want to overload this question any more than necessary.
Has anyone got ideas?
TIA
Mark