I can't control the color of the brush

Question

Please can any one help me in controling the color of a brush, I defined an hbrush and i didn't define any other brushes and i change the color of the brush whenever i want to draw an object , AND after a while , while the program was running i found that all the new objects come with the last color , the color doesn't want to be changed till the end of the program and all the new objects' colors are with the same last color givin to the brush.