I am showing a Tool Tip when Mouse hovers on Help image.
The xaml is given below:
You can force the tool tip to open by setting ToolTip.IsOpen to true. You can get a reference to the ToolTip object by explicitly constructing one when setting the ToolTip property. Instead of
...
write
...
And then in your MouseUp handler do something like:
((ToolTip)((FrameworkElement)sender).ToolTip).IsOpen = true;