The Relationship tab displays foreign key relationships between tables in a graphical format. The following image demonstrates a sample
relationship between different tables in the connected database:

As shown in the diagram above, there is a min-toolbar at the top row in the relation tab.
Each individual button in the toolbar is as explained below :
The save button allows users to save the current document as a jpg file.
The refresh button refreshes the current view of the drawings and resets them to default
The filter button enables filtering of shapes. By default it is set to Filter Selected Table. In this
mode only the currently selected table in Item List Pane and it's relationships will be displayed. You can also remove the filter to display
all the tables or select filter mode to Group, which allows you to view a group of tables. You can create a group by using the
Manage Groups dialog.
The Export Key button allows you to view relationship based on foreign keys that are
exported from a given table.
The Export Key button allows you to view relationship based on foreign keys which are
imported in any given table.
The delete button allows you to delete the selected table, drop a column from the table or drop
a foreign key constraint.
The Zoom Icon allows you to zoom in the entire view area at once to facilitate
viewing of a large number of tables & relationships.Modify Column Dialog :To modify a columns properties.

Rename Table Dialog :To rename a table.

Add Column Dialog :To add a new column to a table.
