Shape's shapesheet data change..

[♥Visio^^]

I load .vsd file in window form drawingcontrol..
and I want to change the shape that mouse clicked.

first I get the shape's color data
c =
shp.CellsSRC(VisSectionIndices.visSectionObject,VisRowIndices.visRowFill,
VisCellIndices.visFillForegnd)
For I use this code, I get the color data(Fill Format section, - FillForegnd
row name)

and I set the FillForegnd's value.
So I confirm. open .vsd file
when I confirm shapesheet, FillForegnd's value has been changed
But shape's color don't changed in drawing page.
Why don't change the shape change in drawing page?

is This Bug??

Please help me.. I am very heavy
shapesheet section FillForegnd changed but this