Bug 327585 Commands, Handlers, and keybindings should use leaf lookup
bundles/org.eclipse.e4.ui.workbench/src/org/eclipse/e4/ui/workbench/modeling/ExpressionContext.java
* (non-Javadoc)
	 * 
	 * @see org.eclipse.core.expressions.IEvaluationContext#removeVariable(java.lang.String)
	 */
	public Object removeVariable(String name) {
		Object obj = eclipseContext.getLocal(name);
		eclipseContext.remove(name);
		return obj;
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.core.expressions.IEvaluationContext#getVariable(java.lang.String)
	 */
	public Object getVariable(String name) {
		Object obj = eclipseContext.get(name);
		return obj == null ? IEvaluationContext.UNDEFINED_VARIABLE : obj;
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.core.expressions.IEvaluationContext#resolveVariable(java.lang.String,
	 * java.lang.Object[])
	 */
	public Object resolveVariable(String name, Object[] args) throws CoreException {
		
		return null;
	}
}