Alternating row background colors inside groups in SSRS

Click on Report Properties, Code tab...

Custom code:

Private bOddRow As Boolean
' -- Display green-bar type color banding in detail rows
' -- Call from BackGroundColor property of all detail row textboxes
' -- Set Toggle True for first item, False for others.
Function AlternateColor(ByVal OddColor As String, _
		 ByVal EvenColor As String, ByVal Toggle As Boolean) As String
	If Toggle Then bOddRow = Not bOddRow
	If bOddRow Then
		Return OddColor
		Return EvenColor
	End If
End Function

First cell in the row, give it this for background color expression:

=Code.AlternateColor("Silver","LightGrey", True)

Every other cell in the row:

=Code.AlternateColor("Silver","LightGrey", False)