constants BackgroundPartEnum
The BackgroundPartEnum type indicates parts of the control whose visual appearance can be changed through the Background property. Use the Add method to add new skins to the control. If you need to remove the skin appearance from a part of the control you need to reset the last 7 bits in the high significant byte of the color being applied to the background's part. The BackgroundPartEnum type supports the following values:

NameValueDescription
exHeaderFilterBarButton0 (reserved) Specifies the background color for the drop down filter bar button.
exFooterFilterBarButton1 (reserved) Specifies the background color for the closing button in the filter bar.
exCellButtonUp2 Specifies the background color for the cell's button, when it is up.
exCellButtonDown3 Specifies the background color for the cell's button, when it is down.
exDaysHeader6 Specifies the visual appearance for the days header.
exWeeksHeader7 Specifies the visual appearance for the weeks header.
exDateHeader8 Specifies the visual appearance for the months header in a calendar control.
exDateTodayUp9 Specifies the visual appearance for the today button in a calendar control, when it is up.
exDateTodayDown10 Specifies the visual appearance for the today button in a calendar control, when it is down.
exDateSeparatorBar13 Specifies the visual appearance for the separator bar in a calendar control.
exMarkToday14 Returns or sets a value that indicates the visual appearance for today date.
exDateHeaderForeColor21 Specifies the foreground color to show the months in the header.
exDaysHeaderForeColor28 Specifies the foreground color for the days header.
exWeeksHeaderForeColor29 Specifies the foreground color for the weeks header.
exMarkTodayForeColor30 Specifies the foreground color for the today date.
exDateTodayForeColor31 Specifies the foreground color for the Today button.
exToolTipAppearance64 Specifies the visual appearance of the borders of the tooltips.
exToolTipBackColor65 Specifies the tooltip's background color.
exToolTipForeColor66 Specifies the tooltip's foreground color.
exCheckBoxState070 Specifies the visual appearance for the check box in 0 state (unchecked). The CheckBoxWidth / CheckBoxHeight property specifies the size of the check-box. 
exCheckBoxState171 Specifies the visual appearance for the check box in 1 state (checked). The CheckBoxWidth / CheckBoxHeight property specifies the size of the check-box.
exCheckBoxState272 Specifies the visual appearance for the check box in 2 state (partial, not used). The CheckBoxWidth / CheckBoxHeight property specifies the size of the check-box.
exRadioButtonState073 Specifies the visual appearance for the radio button in 0 state (unchecked). The RadioButtonWidth / RadioButtonHeight property specifies the size of the radio-button. 
exRadioButtonState174 Specifies the visual appearance for the radio button in 1 state (checked).
exTreeGlyphCollapsed84 Specifies the visual appearance to show the glyph next to the collapsed element.
exTreeGlyphExpanded85 Specifies the visual appearance to show the glyph next to the expanded element.
exTreeLinesColor186 Specifies the color to show the tree-lines (connecting lines from the parent to the children)