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      <div align="center" class="p14"><font color="#000000">BCB中派生VCL类及动态地创建控件</font></div>

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    <td><font color="#000000">以生成一个TMemo的派生类及动态地创建该VCL控件为例。&nbsp;<br>

      Class&nbsp;TMemoEx&nbsp;:&nbsp;public&nbsp;TMemo&nbsp;<br>

      {&nbsp;<br>

      &nbsp;.&nbsp;<br>

      &nbsp;.&nbsp;<br>

      }&nbsp;<br>

      extern&nbsp;TMemoEx&nbsp;memoex;&nbsp;<br>

      &nbsp;<br>

      Class&nbsp;TForm1&nbsp;:&nbsp;Class&nbsp;TForm&nbsp;<br>

      {&nbsp;<br>

      public:&nbsp;<br>

      &nbsp;TMemoEx&nbsp;&nbsp;&nbsp;*MemoEx;&nbsp;<br>

      &nbsp;.&nbsp;<br>

      &nbsp;.&nbsp;<br>

      }&nbsp;<br>

      &nbsp;<br>

      void&nbsp;_fastcall&nbsp;&nbsp;TForm1::FormShow(TObject&nbsp;*Sender)&nbsp;<br>

      {&nbsp;<br>

      &nbsp;MemoEx=new&nbsp;TMemoEx(this);&nbsp;<br>

      &nbsp;MemoEx-&gt;Parent=this;&nbsp;<br>

      &nbsp;.&nbsp;<br>

      &nbsp;.&nbsp;<br>

      }&nbsp;<br>

      总之，遵循以下步骤即可：&nbsp;<br>

      &nbsp;类定义;&nbsp;<br>

      &nbsp;extern&nbsp;TMemoEx&nbsp;memoex;&nbsp;<br>

      &nbsp;TMemoEx&nbsp;&nbsp;&nbsp;*MemoEx;&nbsp;<br>

      &nbsp;MemoEx=new&nbsp;TMemoEx(this);&nbsp;<br>

      &nbsp;MemoEx-&gt;Parent=this;&nbsp;</font></td>

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