Adding custom tab to SharePoint 2010, 2013 Ribbon.
Customize builtin control, tab & group
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Dealing with built-in SharePoint ribbon controls
To capture the images below, we used the controls described in the Ribbon tabs and controls. Here we will modify their properties one by one to give answers to typical questions.
Add a custom tab to SharePoint Ribbon
Create a tab and specify the Ribbons and item types for which you show the tab.
Position a custom tab
Set the Sequence property to specify the position of your tab among other tabs on the SharePoint Ribbon.
Add a custom group to a built-in tab
Specify the ID of the built-in tab to which you add your group and set the Sequence property to position your group among existing groups on the Ribbon.
Add a custom control to a built-in group
Specify the ID of the built-in group to which you add your control. Set the DisplayModeMsp property to specify the way in which your control will be shown. See also How your control is displayed.
Position a custom control in a built-in group
Set the Sequence property to specify the position of your control among other controls on the SharePoint Ribbon.
Customize a built-in button
Specify the ID of the built-in control to override. Note that the built-in control isn't customized – it is replaced with a custom control.
Disable a built-in control
The current version of the Ribbon Designer doesn't provide an option to hide a built-in control directly. However, you can replace the built-in control with a custom one (see Customize a built-in button) and set Enabled = false for the custom control.
Hide a built-in control
The current version of the Ribbon Designer doesn't provide an option to hide a built-in control directly. However, you can replace the built-in SharePoint control with a custom one (see Customize a built-in button) and set Visible = false for the custom control.
Hide a built-in group
For the overridden built-in group set Visible = false.
Hide a built-in tab
For the overridden built-in tab set Visible = false.
Use a built-in control on a custom control container
The Server Ribbon schema doesn't support adding a built-in control to a custom container control such as tab, group, etc.
Disable a built-in group or tab
The Server Ribbon schema doesn't allow disabling a built-in container control such as a tab or group. You may choose to hide the built-in container control, add a custom container control imitating the look of the built-in group or tab and disable it.