I don't have a solution for the color while resizing.

I also have no idea how to make the bar transparent at some places, I'm sorry.

About this: "And the other is that I also have to add bitmap background in toolbar like the titlebar." -> Do you mean you want to have a toolbar with a background? If so, you can find articles of that on codeguru.

About the old buttons showing up while clicking: You need to paint everything yourself, so do not call the baseclass' ::OnNcPaint(); U also have to do that without the WS_SYSMENU style
Code:
//something like: (you can do it in precreatewindow or oninitdialog)
		long gwl = GetWindowLong(this->m_hWnd,GWL_STYLE);
		gwl = gwl & ~WS_SYSMENU;
		SetWindowLong(this->m_hWnd,GWL_STYLE,gwl);
//or just do this before painting:
		ModifyStyle(WS_SYSMENU,0);