Hello Mark,
In order to display
ToolTips when you hover over the invalid cell you can check our
Validation WPF / Silverlight demo. As for the size and styling of the
ToolTip, you can use implicit styles to style it to your liking.
Also, I attached a sample project that demonstrates the approach in the mentioned demo and uses implicit styles to customize the appearance of the ToolTip.
Please examine both examples and let us know if this helps.
Regards,
Boris Penev
Telerik
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