Trying to get query to work the way I want it to work

I have a form with three fields... a start date, an end date, and an employee combobox.  Then I have a query that has this syntax in the Date field:
Between [Forms]![frmTimeReportingHeader]![txtStartDate] And [Forms]![frmTimeReportingHeader]![txtEndDate]

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But in the employee field I either want the record narrowed to the selection on the employee combobox.  This syntax works fine:
[Forms]![frmTimeReportingHeader]![cboEmployee]

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But I cannot figure out what the employee syntax should be if I want all employees.
SteveL13Asked:
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Rey Obrero (Capricorn1)Commented:
try changing this

[Forms]![frmTimeReportingHeader]![cboEmployee]


with

Nz([Forms]![frmTimeReportingHeader]![cboEmployee], [Employee])


try your query without selecting anything from the cboEmployee  combo box


.

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SteveL13Author Commented:
Perfect!  Thank you very much.
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