用VB实现带图片的XP风格的按钮控件

    虽然在VB里实现XP风格很简单，但是要使用XP风格同时又让按钮显示图片，则实现起来要麻烦一些，为此，我写了一个控件来实现前述功能，同时让读者可以从中了解XP主题界面的绘制过程。
    使用办法很简单，在VB里新建一个工程，然后添加一个控件模块，粘贴以下代码，再将控件放置到窗口即可，当然，可别忘设置图片和文字属性，具体代码如下：
'* ************************************************** *
'* 模块名称：CommandButtonEx.ctl
'* 模块功能：带图片的XP风格的按钮控件
'* 编码：lyserver
'* 联系方式：http://blog.csdn.net/lyserver
'* ************************************************** *
Option Explicit
'----------------------------------------------------
'API声明
'----------------------------------------------------
Private Type RECT
Left As Long
Top As Long
Right As Long
Bottom As Long
End Type
Private Type POINTAPI
x As Long
y As Long
End Type
Private Type SIZE
cx As Long
cy As Long
End Type
Private Enum THEMESIZE
TS_MIN '// minimum size
TS_TRUE '// size without stretching
TS_DRAW '// size that theme mgr will use to draw part
End Enum
Private Declare Function OpenThemeData Lib "uxtheme.dll" (ByVal hwnd As Long, ByVal pszClassList As Long) As Long
Private Declare Function CloseThemeData Lib "uxtheme.dll" (ByVal hTheme As Long) As Long
Private Declare Function DrawThemeBackground Lib "uxtheme.dll" (ByVal hTheme As Long, ByVal lHDC As Long, ByVal iPartId As Long, ByVal nStateId As Long, pRect As RECT, pClipRect As RECT) As Long
Private Declare Function DrawThemeParentBackground Lib "uxtheme.dll" (ByVal hwnd As Long, ByVal hdc As Long, prc As RECT) As Long
Private Declare Function GetThemePartSize Lib "uxtheme.dll" (ByVal hTheme As Long, ByVal hdc As Long, ByVal iPartId As Long, ByVal nStateId As Long, prc As RECT, ByVal eSize As Long, psz As SIZE) As Long
Private Declare Function GetThemeBackgroundContentRect Lib "uxtheme.dll" (ByVal hTheme As Long, By