The MATLAB Add-in for Visual Studio has been obsoleted as of the release of MATLAB 7.0 (R14). If you are using a previous release of MATLAB, read the following:
Confirm you have the MATLAB Add-in entirely set up. If the add-in is not set up, you will not see the toolbar.
To set up the add-in, you should run the following command and select MSVC as the compiler:
mbuild -setup
For more information on this, refer to the following solution:
If you have set up the MATLAB Add-in, but are still not able to see the toolbar, then it is possible you have not selected the MATLAB Add-in toolbar within your MSVC settings. To make the MATLAB Add-in toolbar visible:
1) Select the Tools->Customize... menu option
2) Check the toolbar for MATLAB Add-in. Please note that the MATLAB Add-in toolbar may not have the name 'MATLAB Add-in'. It may be called 'Toolbar1'. If the check box next to it is not checked, activate the checkbox and you should be able to see the toolbar.
3) You can also modify the name of the toolbar in the text box below the listbox to something more intuitive.
If this does not help, check to see if enabling another option, like Toolbar 2, makes the toolbar visible. The toolbar does not have a specific name; you may need to use a trial and error approach to find the right one.
Another way to explicitly add the MATLAB Add-in to MSVC environment is to do the following:
1) Select the Tools->Customize... menu option
2) Click on the Add-in and Macro Files Tab
3) If there is an entry for MATLAB Add-in, select the check box against it.
4) If there is no entry for MATLAB Add-in or you want to make sure that you are using the right Add-in, click on the Browse button at the bottom right corner
5) Browse to $MATLAB\bin\win32 directory and select MATLABAddin.dll file, where $MATLAB is the root MATLAB directory.
6) MSVC may give a message saying that the Add-in file will be replaced. Hit OK.
7) Close the dialog box and the Toolbar should appear in your MSVC environment
