The Placeholder character is a character used to represent the absence of user input in RadMaskedTextBox. The default value is underscore (_). The Placeholder character will be displayed in RadMaskedTextBox for any mask position that the user has not filled in yet.
CopyXAML
<telerik:RadMaskedTextBox Mask="0000" MaskType="Standard" />
If you want to change the default Placeholder, you should set the RadMaskedTextBox's Placeholder property, like in the example below:
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<telerik:RadMaskedTextBox Mask="0000"
MaskType="Standard"
Placeholder="$" /> Tip |
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| You can set a watermark content to the RadMaskedTextBox by using the EmptyContent and EmptyContentTemplate properties. When the Value of the RadMaskedTextBox is null or empty the EmptyContent will be displayed. For more information, read Watermark. |