没看懂ResizableLib的demo代码，特来请教。

AddAnchor(IDC_STATIC2, TOP_LEFT);
AddAnchor(IDC_EDIT1, TOP_LEFT, ANCHOR(40,100));
AddAnchor(IDC_BUTTON1, BOTTOM_LEFT, ANCHOR(40,100));
AddAnchor(IDC_BUTTON2, BOTTOM_LEFT, ANCHOR(40,100));
AddAnchor(IDC_GROUP1, ANCHOR(40,0), BOTTOM_RIGHT);
AddAnchor(IDC_COMBO1, ANCHOR(40,0), TOP_RIGHT);
AddAnchor(IDC_RADIO1, ANCHOR(70,0), ANCHOR(70,0));
AddAnchor(IDC_RADIO2, ANCHOR(70,0), ANCHOR(70,0));
AddAnchor(IDC_RADIO3, ANCHOR(70,0), ANCHOR(70,0));
AddAnchor(IDC_STATIC1, ANCHOR(40,0), BOTTOM_RIGHT);
AddAnchor(IDC_ICON1, ANCHOR(40,0), ANCHOR(70,0));
ResizeableFormViewMDI这个DEMO中这段代码中的AddAnchor实在是看不懂，请教诸位大侠。
附ResizableLib的链接
http://www.codeproject.com/KB/dialog/resizablelib.aspx