I've noticed that there are some differences between several controls regarding watermark styling and left padding. It becomes quite visible if you put them next to each other. The left column only contains watermarkcontent and the right one contains text. I'm using the Windows7Theme but it looks the same in several other themes aswell.
<
StackPanel
Orientation
=
"Horizontal"
>
<
StackPanel
Width
=
"200"
HorizontalAlignment
=
"Left"
>
<
telerik:RadWatermarkTextBox
Margin
=
"3"
WatermarkContent
=
"RadWatermarkTextBox"
/>
<
telerik:RadAutoCompleteBox
Margin
=
"3"
WatermarkContent
=
"RadAutoCompleteBox"
/>
<
telerik:RadMaskedTextInput
HorizontalAlignment
=
"Stretch"
Margin
=
"3"
EmptyContent
=
"RadMaskedTextInput"
TextMode
=
"PlainText"
/>
<
telerik:RadComboBox
IsEditable
=
"True"
Margin
=
"3"
EmptyText
=
"RadComboBox"
/>
</
StackPanel
>
<
StackPanel
Width
=
"200"
HorizontalAlignment
=
"Left"
>
<
telerik:RadWatermarkTextBox
Margin
=
"3"
Text
=
"RadWatermarkTextBox"
/>
<
telerik:RadAutoCompleteBox
Margin
=
"3"
SearchText
=
"RadAutoCompleteBox"
/>
<
telerik:RadMaskedTextInput
HorizontalAlignment
=
"Stretch"
Margin
=
"3"
Value
=
"RadMaskedTextInput"
TextMode
=
"PlainText"
/>
<
telerik:RadComboBox
IsEditable
=
"True"
Margin
=
"3"
Text
=
"RadComboBox"
/>
</
StackPanel
>
</
StackPanel
>