Drop down menu

I am using the kubrick default theme for mu blog.Every time a ‘child page’ is created the title of the page will appear under the parent’s title name in the side bar. The same also happens when another ‘child page’ is created under the first ‘child page’. So much so the sidebar is cluttered with all the titles of the ‘parent pages’,’child pages’ and ‘grand child pages’. Combined with other items that you include in the side bar, the appearance of the side bar is really messy.

How can/do I make it that only the ‘parent page’ titles appears on the side bar whilst the respective titles of the ‘child’ and ‘grand child’ pages will only appear when I hover or place the cursor over the ‘parent page’ title.

Would really appreciate anyone’s held on this.

nj.