Bug 273489 [Mac] We should not nest sheets
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/ide/dialogs/PathVariableDialog.java
message = IDEWorkbenchMessages.PathVariableDialog_pathDoesNotExistMessage;
            newValidationStatus = IMessageProvider.WARNING;
            allowFinish = true;
        } else {
            allowFinish = true;
        }
        
        
        if (validationStatus == IMessageProvider.NONE
                || newValidationStatus > validationStatus) {
            validationStatus = newValidationStatus;
            validationMessage = message;
        }
        setMessage(validationMessage, validationStatus);
        return allowFinish;
    }
    /**
     * Returns the variable name.
     * 
     * @return the variable name
     */
    public String getVariableName() {
        return variableName;
    }
    /**
     * Returns the variable value.
     * 
     * @return the variable value
     */