Specify the initial values to be displayed in a pattern control. This helps the user to identify which values are allowed in a pattern control. The literal mask is restricted by the format specified by the edit mask.
指定要在模式控件中显示的初始值。这可以帮助用户确定模式控件中允许使用的值。字符掩码受编辑掩码所指定的格式的限制。