[vtkusers] How to check the key is pressed?

[Andrej Gluhov]

How to check the key(alt, ctrl, shift) is pressed in Callback functions?
public void KeyDown(vtkObject caller, uint eventId, object clientData,
IntPtr callData)
{
//What the key was pressed?
}

-- 
С Уважением,
Андрей.
Best regards, Andrew
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