请教一个用二进制显示数值的问题

    怎么样或什么情况下才能在数值型控件或显示件里输出字符用二进制或其它进制显示
，怎么老是灰色的不可选状态！
    还有就是用到picture function时怎么样创建代表颜色的常量！
多谢了

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