Hi Zach Mathews,
The Are you setting the Header or HeaderTemplate of the column? In this case the tooltip should appear in the column header in the header of the control.
If you want the tooltip to appear over rows of the controls then you can place the tooltip in the CellTemplate for the given column.
Could there be a databinding error? Is there anything in the output window to indicate this?
Does the tooltip appear if the string is hardcoded instead of databound?
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