I’ve added the close file button to each extension. It should be particularly useful in SSMS where you more often need to close a file rather than a whole tab:
Close file buttons in SSMS
In the default style these buttons are collapsed, but you can use all usual properties in a custom style to make them visible. For example, the following style makes close file buttons visible on the selected tab and hides the close tab button in a tab when it contains more than a one extension:
<Style TargetType="TabsStudio:TabExtensionCloseButton" BasedOn="{StaticResource DefaultTabExtensionCloseButton}">
<Style.Triggers>
<Trigger Property="IsTabSelected" Value="True">
<Setter Property="Visibility" Value="Visible"/>
</Trigger>
</Style.Triggers>
</Style>
<Style TargetType="TabsStudio:CloseTabButton" BasedOn="{StaticResource DefaultCloseTabButtonStyle}">
<Style.Triggers>
<Trigger Property="IsMultiExtensions" Value="True">
<Setter Property="Visibility" Value="Collapsed"/>
</Trigger>
</Style.Triggers>
</Style>
Tabs Studio Blog (organizing Visual Studio document tabs) 