FontWeightComboBox

A ComboBox that lists the standard font weights (Thin through ExtraBlack), each entry rendered in the weight it names. The selection is exposed both as a FontWeight and as a string name, so a view model can bind whichever it stores.

<mosaic:FontWeightComboBox SelectedFontWeight="{Binding HeadingWeight, Mode=TwoWay}" />

Previews are on by default; turn them off for plain text:

<mosaic:FontWeightComboBox
    PreviewFontSize="16"
    ShowWeightPreview="False"
    SelectedFontWeightName="{Binding HeadingWeightName, Mode=TwoWay}" />

Property	Type	Default	Description
SelectedFontWeight	FontWeight	FontWeights.Normal	The selected weight. Two-way by default.
SelectedFontWeightName	string?	null	The selected weight name, e.g. SemiBold. Two-way by default.
ShowWeightPreview	bool	true	Renders each weight name in its own weight.
PreviewFontSize	double	14	Size of the preview text.

Notes:

• The item list comes from FontWeightCatalog — do not set ItemsSource manually.
• Ten distinct weights are listed: Thin, ExtraLight, Light, Normal, Medium, SemiBold, Bold, ExtraBold, Black, ExtraBlack. The aliases (Regular, DemiBold, UltraBold, Heavy, UltraLight, UltraBlack) are not listed separately because they resolve to the same OpenType weights, but FontWeightCatalog.Find still accepts them — as it does the numeric weights, e.g. "600".
• SelectedFontWeight, SelectedFontWeightName, and SelectedItem all stay in sync; setting any one updates the others.
• A non-standard weight cannot be selected and leaves the selection empty.
• Assigning an ItemTemplate explicitly overrides whatever ShowWeightPreview would apply.
• The control reuses the standard (or opt-in native Mosaic) ComboBox styling — no custom template.
• The PropertyGrid uses this control automatically for any FontWeight property.

See also: FontComboBox, FontAutoCompleteBox.