bmprgnform is an irregular form controls, you can use it to make Windows Media Player similar to the style.

Packet : 93317479bmprgnform_src.zip filelist
BitmapRegionTest/App.ico
BitmapRegionTest/AssemblyInfo.cs
BitmapRegionTest/back.bmp
BitmapRegionTest/BitmapRegion.cs
BitmapRegionTest/BitmapRegionLibTest.suo
BitmapRegionTest/BitmapRegionTest.csproj
BitmapRegionTest/BitmapRegionTest.csproj.user
BitmapRegionTest/BitmapRegionTest.sln
BitmapRegionTest/BitmapRegionTest.suo
BitmapRegionTest/bob.bmp
BitmapRegionTest/bobsay.bmp
BitmapRegionTest/Form1.cs
BitmapRegionTest/Form1.resx
BitmapRegionTest/greenbtndown.bmp
BitmapRegionTest/greenbtnup.bmp
BitmapRegionTest/smiles.bmp
BitmapRegionTest/smilesangry.bmp
BitmapRegionTest/x.bmp
BitmapRegionTest/xsmile.bmp

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