To fast access to "Build Project" command you can define a keyboard shortcut (e.g. <F6>, you can use any other free 
keystroke).

The following procedure lets you define build shortcut which would work from Project Navigator and C++ Editor (for IDE 4
.5 and 4.6).

    * Select Windows->Preferences...
    * Type "Keys" in the filter (top left)
    * Select "Keys" from the left tree
    * Check "Include unbound commands" checkbox
    * Type "build" in right panel filter
    * Select "Build Project" command
    * Select Binding field
    * Press keystroke <F6>
    * Click Apply
    * Click Copy command
    * Select "C/C++ Editor" in When combo box
    * Select Binding field and press <F6>
    * Click Apply again