Hello Support!
EDIT: Solved. I've used the internal images!I try to change my Grids for CSS without success. Every formatting is lost, if I use the CssClass tags instead of the CssText tags.
Is there some special setup necessary?
For your information, here is what I have done:
1. Create a new WebPage and add a Grid
2. Select  “Vista style grid”
3. Add a datasource in the CS file
4. Start project => everything is fine
5. Open the Grid Builder again
6. Select “To CSS Class”
7. Enter a name like “MyGrid”
8. Start project again => Every formatting (header, etc.) is lost.
    
        Code: HTML/ASPX
        
        <eo:Grid ID="Grid1" runat="server" BorderColor="#828790" BorderWidth="1px" ColumnHeaderAscImage="00050204" ColumnHeaderDescImage="00050205" ColumnHeaderDividerImage="00050203" ColumnHeaderHeight="24" CssBlock="<style type="text/css">
.MyGrid1 {background-image:url('00050201');padding-left:8px;padding-top:4px}
.MyGrid2 {background-image:url('00050202');padding-left:8px;padding-top:4px}
.MyGrid3 {padding-bottom:4px;padding-left:4px;padding-right:4px;padding-top:4px}
.MyGrid4 {background-color:white}
.MyGrid5 {background-image:url(00050206);background-repeat:repeat-x}
.MyGrid6 {background-image:url(00050207);background-repeat:repeat-x}
.MyGrid7 {padding-left:8px;padding-top:2px;white-space:nowrap}
</style>" FixedColumnCount="1" Font-Bold="False" Font-Italic="False" Font-Names="Tahoma" Font-Overline="False" Font-Size="8.75pt" Font-Strikeout="False" Font-Underline="False" GridLineColor="240, 240, 240" GridLines="Both" Height="200px" ItemHeight="19" Width="380px">
            <ItemStyles>
                <eo:GridItemStyleSet StyleSetID="_Default">
                    <ItemStyle CssClass="MyGrid4" />
                    <ItemHoverStyle CssClass="MyGrid5" />
                    <SelectedStyle CssClass="MyGrid6" />
                    <CellStyle CssClass="MyGrid7" />
                </eo:GridItemStyleSet>
            </ItemStyles>
            <ColumnHeaderStyle CssClass="MyGrid1" />
            <ColumnHeaderHoverStyle CssClass="MyGrid2" />
            <Columns>
                <eo:RowNumberColumn>
                </eo:RowNumberColumn>
                <eo:StaticColumn HeaderText="Header">
                </eo:StaticColumn>
                <eo:StaticColumn HeaderText="Header">
                </eo:StaticColumn>
            </Columns>
            <ColumnTemplates>
                <eo:TextBoxColumn>
                    <TextBoxStyle CssText="BORDER-RIGHT: #7f9db9 1px solid; PADDING-RIGHT: 2px; BORDER-TOP: #7f9db9 1px solid; PADDING-LEFT: 2px; FONT-SIZE: 8.75pt; PADDING-BOTTOM: 1px; MARGIN: 0px; BORDER-LEFT: #7f9db9 1px solid; PADDING-TOP: 2px; BORDER-BOTTOM: #7f9db9 1px solid; FONT-FAMILY: Tahoma" />
                </eo:TextBoxColumn>
                <eo:DateTimeColumn>
                    <DatePicker runat="server" DayCellHeight="16" DayCellWidth="19" DayHeaderFormat="FirstLetter" DisabledDates="" OtherMonthDayVisible="True" SelectedDates="" TitleLeftArrowImageUrl="DefaultSubMenuIconRTL" TitleRightArrowImageUrl="DefaultSubMenuIcon">
                        <PickerStyle CssText="border-bottom-color:#7f9db9;border-bottom-style:solid;border-bottom-width:1px;border-left-color:#7f9db9;border-left-style:solid;border-left-width:1px;border-right-color:#7f9db9;border-right-style:solid;border-right-width:1px;border-top-color:#7f9db9;border-top-style:solid;border-top-width:1px;font-family:Courier New;font-size:8pt;margin-bottom:0px;margin-left:0px;margin-right:0px;margin-top:0px;padding-bottom:1px;padding-left:2px;padding-right:2px;padding-top:2px;" />
                        <CalendarStyle CssText="background-color: white; border-right: #7f9db9 1px solid; padding-right: 4px; border-top: #7f9db9 1px solid; padding-left: 4px; font-size: 9px; padding-bottom: 4px; border-left: #7f9db9 1px solid; padding-top: 4px; border-bottom: #7f9db9 1px solid; font-family: tahoma" />
                        <TitleStyle CssText="background-color:#9ebef5;font-family:Tahoma;font-size:12px;padding-bottom:2px;padding-left:6px;padding-right:6px;padding-top:2px;" />
                        <TitleArrowStyle CssText="cursor:hand" />
                        <MonthStyle CssText="font-family: tahoma; font-size: 12px; margin-left: 14px; cursor: hand; margin-right: 14px" />
                        <DayHeaderStyle CssText="font-family: tahoma; font-size: 12px; border-bottom: #aca899 1px solid" />
                        <DayStyle CssText="font-family: tahoma; font-size: 12px; border-right: white 1px solid; border-top: white 1px solid; border-left: white 1px solid; border-bottom: white 1px solid" />
                        <DayHoverStyle CssText="font-family: tahoma; font-size: 12px; border-right: #fbe694 1px solid; border-top: #fbe694 1px solid; border-left: #fbe694 1px solid; border-bottom: #fbe694 1px solid" />
                        <TodayStyle CssText="font-family: tahoma; font-size: 12px; border-right: #bb5503 1px solid; border-top: #bb5503 1px solid; border-left: #bb5503 1px solid; border-bottom: #bb5503 1px solid" />
                        <SelectedDayStyle CssText="font-family: tahoma; font-size: 12px; background-color: #fbe694; border-right: white 1px solid; border-top: white 1px solid; border-left: white 1px solid; border-bottom: white 1px solid" />
                        <DisabledDayStyle CssText="font-family: tahoma; font-size: 12px; color: gray; border-right: white 1px solid; border-top: white 1px solid; border-left: white 1px solid; border-bottom: white 1px solid" />
                        <OtherMonthDayStyle CssText="font-family: tahoma; font-size: 12px; color: gray; border-right: white 1px solid; border-top: white 1px solid; border-left: white 1px solid; border-bottom: white 1px solid" />
                    </DatePicker>
                </eo:DateTimeColumn>
                <eo:MaskedEditColumn>
                    <MaskedEdit runat="server" ControlSkinID="None" TextBoxStyle-CssText="BORDER-RIGHT: #7f9db9 1px solid; PADDING-RIGHT: 2px; BORDER-TOP: #7f9db9 1px solid; PADDING-LEFT: 2px; PADDING-BOTTOM: 1px; MARGIN: 0px; BORDER-LEFT: #7f9db9 1px solid; PADDING-TOP: 2px; BORDER-BOTTOM: #7f9db9 1px solid; font-family:Courier New;font-size:8pt;">
                    </MaskedEdit>
                </eo:MaskedEditColumn>
            </ColumnTemplates>
            <FooterStyle CssClass="MyGrid3" />
        </eo:Grid>