Rect drawn using AVToolRec is not working on acrobat 10.

Hi,

I need to draw a rectangle from mouse start to end.I have created tool and it is working fine on acrobat 6.but for acrobat 10 when i drawn
rect using this tool then rect is not visible.Is anything need to add to the tool for acrobat 10 so that rect is visible?

void SetUpSignTool(void)
{

/* Set up the AVToolRec.  Don't forget to set the size field! */

memset(&gMaskingTool, 0, sizeof(AVToolRec));

signTool.size = sizeof(AVToolRec);

signTool.Activate = ASCallbackCreateProto(ActivateProcType, &SigningToolActivate);

signTool.Deactivate = ASCallbackCreateProto(DeactivateProcType, &SigningToolDeactivate);

signTool.GetType = ASCallbackCreateProto(GetTypeProcType, &SigningToolGetType);

signTool.AdjustCursor = ASCallbackCreateProto(AdjustCursorProcType, &SigningToolAdjustCursor);

signTool.DoClick = ASCallbackCreateProto(DoClickProcType, &SigningToolDoClick);

signTool.ComputeEnabled = ASCallbackCreateProto(AVComputeEnabledProc,&SigningToolIsEnabled);

signTool.computeEnabledData = NULL;

AVAppRegisterTool(&signTool);

}

Please Help me.

Regards,