Hello Ankur,

- To remove Done and Cancel buttons set the [showDoneCancelButtons](http://igniteui.com/help/api/2016.1/ui.iggridupdating#options:rowEditDialogOptions.showDoneCancelButtons) option to false

Example:

features: [{
name: "Updating",
showDoneCancelButtons: false,
editMode: "cell",
columnSettings: [
{
columnKey: "Title",
editorOptions: {
validation: true,
validatorOptions: {
onblur: true,
custom: {
method: function(value) {
if (value === "CEO") {
return false;
}
return true;
},
errorMessage: "You cannot enter CEO title"
}
}
}
}
]
}]

- To validate the data use the [columnSettings.editorOptions.validatorOptions](http://igniteui.com/help/api/2016.1/ui.iggridupdating#options:columnSettings.editorOptions) setting as shown in the code snippet above

- To have only one row expanded at a time handle the [rowExpanding](http://igniteui.com/help/api/2016.1/ui.ighierarchicalgrid#events:rowExpanding) event and collapse the other expanded rows.

Example:

rowExpanding: function (evt, ui) {
$("#hgrid1 tr[aria-expanded=true]").each(function (ix, el) {
$("#hgrid1").igHierarchicalGrid("collapse", el);
});
}

In this code snippet the "hgrid1" is the ID of the `igHierarchicalGrid` DOM placeholder

Hope this helps,
Martin Pavlov
Infragistics, Inc.