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<syncfusion:SfCalendar.MonthViewSettings>
<syncfusion:MonthViewSettings>
<syncfusion:MonthViewSettings.InlineItemTemplate>
<DataTemplate>
<Button BackgroundColor="Purple" Text="{Binding Subject}" TextColor="White" />
</DataTemplate>
</syncfusion:MonthViewSettings.InlineItemTemplate>
</syncfusion:MonthViewSettings>
</syncfusion:SfCalendar.MonthViewSettings>