[Help] What's the reason?

[lovespy108]

At directory page:
Required Space : A KB
Available Space: B GB (A,B are numbers)
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I changed the two lable's color: font colos is blue(also other colors),background color is TRANSPARENT.

In directory EditBox,I preset the directory to "C:\xx\.."(or "D:\xx\..",and so on).Now I browse and choose the install directory to be "C:\"(or "D:\",and so on).the first B overlapped with the second B(B is available space number).Then I choose any other directory,this time's B always overlapped with last time's.

When I minimize the dialog then come back to the dialog,the number is shown normally.Also,when I go back to front page then come back to this page,the number is shown normally.If I don't change the lable's color,it's shown normally too.

What's the reason?Maybe I expressed ambiguously.Hope you can understand.
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Another two questions:
1.If the directory is "C:\"(or "D:\",and so on),why the "installation button" cannot be activated?I want it to be activated.
2.At the end of directory,it is added a '\' symbol automatically.That doesnot look well.How to remove it?especially tell me the way to remove it when I choose the direcotry with "browse button".
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Thank you very muck...

[kichik]

When you set the background color of some control to transparent, it's your responsibility to redraw it after every change. As that'd be a bit hard for those controls that change without your control, it'd be easier to pick a background color that fits best but is not transparent.

Root directories are not supported by the installer by default. Use AllowRootDirInstall to override this setting.

You can't remove the extra back slash. It's required when you select root directories or the directory would be invalid.