Custom Package/Theme for Admin module that falls back to default package?

Question

How Do i ask magento to use a custom layout package/theme for my custom admin module?

What's the Structure and content that i have to include inside local.xml file if i have to use it for defining a custom design package?

Please tell if there are also other ways of doing this..

Answer 1

add these lines in app/etc/local.xml (or) {yourPKG/yourModule/etc/config.xml} file under <config> tag

Its better If you add it inside your module's Config folder for the reasons specied by @Marius under the comments..

 <stores>
        <admin>
            <design>
                <package>
                    <name>default</name>
                </package>
                <theme>
                    <default>MyCustomTheme</default>
                </theme>
            </design>
        </admin>
</stores>

where MyCustomTHeme is your theme folder inside app/design/adminhtml/default/MyCustomTheme

This method takes your MyCustomTheme as default theme and uses FallBack for any layout that is not found.

Adding the above line's inside app/etc/config.xml showed no effect.

And changing the Package folder name from default to "myNewPAckage" had overridden the default and required me to copy whole default into myNewPAckage folder else nothing worked.

So, to have FallBack effect, keep the package as default and give theme as yourCustomTheme.