Bug 312959 [Import/Export] importing file from big disk hangs UI
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/wizards/datatransfer/WizardFileSystemResourceImportPage1.java
handleSourceBrowseButtonPressed();
		}
        super.handleEvent(event);
    }
    /**
     *	Open an appropriate source browser so that the user can specify a source
     *	to import from
     */
    protected void handleSourceBrowseButtonPressed() {
        String currentSource = this.sourceNameField.getText();
        DirectoryDialog dialog = new DirectoryDialog(
                sourceNameField.getShell(), SWT.SAVE | SWT.SHEET);
        dialog.setText(SELECT_SOURCE_TITLE);
        dialog.setMessage(SELECT_SOURCE_MESSAGE);
        dialog.setFilterPath(getSourceDirectoryName(currentSource));
        String selectedDirectory = dialog.open();
        if (selectedDirectory != null) {
            
            if ((getSourceDirectory(selectedDirectory) == null)
                    || selectedDirectory.equals(currentSource)) {
				return;
			}
            
            setErrorMessage(null);
            setSourceName(selectedDirectory);
            selectionGroup.setFocus();
        }
    }
    /**
     * Open a registered type selection dialog and note the selections