If you do not need a heavy grid component as a ComboBox picker, you can always modify the BoundList XTemplate to present the data as table. Of course you will not have all the features which are presented in grid e.g. renderers, checkbox selection model, filtering etc. and you will have to work on cross browsers problem but it costs the efforts in some cases.
I have already shown how to implement a Tree ComboBox. In the following example you can see how to implement a simpler ComboBox with a grid picker. It is implemented with support of the local and remote filtering. I have used also a calculated model field ‘fullName’ to use it as display value in the combo. You can also use as ‘displayTpl’ property to achieve the same effect.