Hi Brian,
Inside the custom command function ‘this’ is in the context of the function. It should be Ok if you define it like that:

		const that = this;
		window.commandColumnCustomCommand = function (row) {
			that.setState({showWarehouseId: row.data.id}, () => {
			console.log(that.state.showWarehouseId)
		})};

Regarding the ‘class’ and ‘className’, you are right. Using class instead of className produces warnings and in strict mode errors. We will update the samples.
Hope this helps.
Best regards,
Peter Stoev
Smart UI Team
https://www.htmlelements.com/