Hi Mitul,
You need to create a custom celltype to do this. The ColorUIControl of the GridDropDownColorUICellRenderer is private. To have only the StandardColors in the color edit cell's drop down ColorUIControl, we can have our own DropDownColorUICellRenderer. Here is a sample which displays only the StandardColors using a custom cell type called MyColorEdit.
To avoid typing into the cell, you can handle the TableControlCurrentCellStartEditing event and set e.Inner.Cancel = true.
Here is a sample download link
http://websamples.syncfusion.com/samples/Grid.Windows/F61575/main.htmRegards,
Rajagopal