Can be reproduced in the WPF demo (Windows8 theme): the error description tooltip appears on the left of the control and with the red arrow on the left (see attachment). The tooltip should appear on the same side of the red adorned element (the red triangle, top right corner) and the tooltip arrow should point the control.
Hello Daniel,
An alternative approach that I could suggest, instead of setting the SystemParameters.MenuDropAlignment property would be to modify the error tooltip. More specifically, remove the tooltip's arrow, which is displayed on the left. This way, even if the error tooltip is displayed on the left side of the control, it will not display the arrow and indicate that it is wrongly placed.
To achieve this result, extract the control template that is set to the Validation.ErrorTemplate property of the RadComboBox control for the Windows 8 theme. The ControlTemplate has an x:Name="ValidationToolTipTemplate". The template contains a ToolTip element with x:Name="PART_ToolTip", which displays the error message as well as the arrow. The arrow is defined in the control template that is set to the Template property of this tooltip element (it has an x:Name="ErrorTooltipTemplate"). This control template could be extracted as well and the Path element that is contained inside could be removed.
By following these steps, the produced result will be as follows:
With this being said, I have attached a sample project, so, could you give it a try?
Regards,
Stenly
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