<extension
         point="org.eclipse.xtext.ui.shared.overridingGuiceModule">
      <module
            class="org.xtext.example.mydsl.ui.OverwriteSharedModule">
      </module>
   </extension>

package org.xtext.example.mydsl.ui;

import com.google.inject.Binder;
import com.google.inject.Module;

public class OverwriteSharedModule implements Module {

        public OverwriteSharedModule() {
        }

        public void configure(Binder binder) {
                binder.bind(From.class).to(To.class);

        }

}