Correct the issue by adding the following registry entry on the server:
Key:
[HKEY_LOCAL_MACHINE]SYSTEMCurrentControlSetControlCitrixWfshellTWIAny_Subkey_Name
Values:
"ClassName" = "Your_Class_Name", REG_SZ
"Type" = 1, REG_DWORD.
Where "Your_Class_Name" is the class name. The class name can be determined by using Spy++ in Visual Studio 6 (Navigate to Visual Studio 6, Spy, Find Window and then drag the crosshair to the window for which you are trying to obtain the information).
"Any_Subkey_Name" can be any name. All subkeys are enumerated regardless of the name.
Adding this registry entry marks your control as an exception and Seamless will not perform local client move/resize operations for this control.