Selenium IDE ExtJS Multiple Dropdown

Hi All,
Thanks in advanced for looking into the issue. I have a extjs page with
multiple drop downs and you'd have to click on the image icon so see
the dropdown list.

This is the code below will select the image for the drop down list in Selenium IDE

//img[contains(@class, 'x-form-trigger x-form-arrow-trigger')]

after the image icon is pressed below is the code to select the item for from the drop down

//div[contains(@class, 'x-combo-list-inner')]/descendant::div[contains(@class, 'x-combo-list-item')][text()='Staff'][1]


the issue is the //img class "x-form-trigger x-form-arrow-trigger" has the same class names for all the dropdowns on the page.

How would you select multiple dropdown list? if you select one drop down
the others can't be selected because the img class name is the same for
all the select drop downs.