Bug 148357 [Field Assist] - API - provide access for closing the proposal popup
I think that the field assist API needs more hooks to be customizable. For example : 1) There is no way to manually close/open the popup. Most of the times, this is the easier thing for a user to ask to implement his custom behaviour. 2) There is no way to intercept keystrokes/events directed to the field. 3) There is no way to control focus.
bundles/org.eclipse.jface/src/org/eclipse/jface/fieldassist/ContentProposalAdapter.java
}
	}
	
	/**
	 * Open the proposal popup and display the proposals provided by the
	 * proposal provider. This method returns immediately. That is, it does not
	 * wait for a proposal to be selected.  This method is used by subclasses
	 * to explicitly invoke the opening of the popup.  If there are no proposals
	 * to show, the popup will not open and a beep will be sounded.
	 */
	protected void openProposalPopup() {
		openProposalPopup(false);
	}
	/*
	 * A content proposal has been accepted. Update the control contents
	 * accordingly and notify any listeners.
	 * 
	 * @param proposal the accepted proposal
	 */
	private void proposalAccepted(IContentProposal proposal) {
		switch (proposalAcceptanceStyle) {
		case (PROPOSAL_REPLACE):
			setControlContent(proposal.getContent(), proposal
					.getCursorPosition());
			break;
		case (PROPOSAL_INSERT):
			insertControlContent(proposal.getContent(), proposal
					.getCursorPosition());
			break;
		default: