MaxGUI: Multiply Canvas crashes

When Im trying to put some graphics on my second canvas, but it crash with a DX error. Blitz+ could without issues, but why can BlitzMax not?

Global Data, X, Y, Do$

Global Refresh:TGadget
Global TimeLine:TGadget
Global ShowG:TGraphics
Global TimeLineG:TGraphics





Local wx=ClientWidth(Desktop())/2-1024/2
Local wy=ClientHeight(Desktop())/2-768/2
Local Window:TGadget=CreateWindow("Test", wx, wy, 1024, 768, Null, WINDOW_TITLEBAR | WINDOW_MENU | WINDOW_STATUS | WINDOW_CLIENTCOORDS)
Show=CreateCanvas(224, 0,800,600,Window,0)
TimeLine=CreateCanvas(244,600,0,160,Window,0)

ShowG=CanvasGraphics(Show)
TimeLineG=CanvasGraphics(TimeLine)

SetGraphicsDriver D3D7Max2DDriver()


Repeat
	SetGraphics ShowG
	SetClsColor(0, 0, 0)
	Cls()

	' HUNC on the secound canvas????? BUG? (DXERROR err=UNKNOWN:-2147024809 87)
	' How do I create multiply canvas and draw on them without crash?
	SetGraphics TimeLineG
	SetClsColor(255, 255, 255)
	Cls()

	Flip 1
Forever

For my side this may should been moved to BlitzMax bug, if this is a bug.