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component colors

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Hi all!
According to Java 2 Certification Study Guide (RHE):
If you do not explicitly set a component's foreground or background color, the component uses the foreground and background color of its immediate container.
I have an applet which contains several panels (navigate using a CardLayout). Each panel contains buttons. I thought that if the buttons were not explicitly assigned a background color, they should use the background color of the panel which contains them. This is not the case, however. I need to set the button background color explicitly to make it match the panel background. (If I do not, the button background defaults to gray). Does anyone know why this is the case?
Thanks in advance.
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i dont think the component will retain the color of immediate container.for any component,u need to explicitly set the color.
Also as panel is invisible component,and panel is a container for
placing components,the components will not inherit the color.
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