Bug 273489 [Mac] We should not nest sheets
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/ide/dialogs/PathVariableDialog.java
public String getVariableValue() {
        return variableValue;
    }
    /**
     * Sets the variable name.
     * 
     * @param variableName the new variable name
     */
    public void setVariableName(String variableName) {
        this.variableName = variableName.trim();
        this.originalName = this.variableName;
    }
    /**
     * Sets the variable value.
     * 
     * @param variableValue the new variable value
     */
    public void setVariableValue(String variableValue) {
        this.variableValue = variableValue;
    }
    
    /*
     * (non-Javadoc)
     * @see org.eclipse.jface.dialogs.Dialog#isResizable()
     */
    protected boolean isResizable() {
    	return true;
    }
}