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private void SetContentColor(PDFXEdit.IPXV_Document Doc, PDFXEdit.PXV_Inst Inst)
{
	if (Doc == null)
		return;
	//Creating contentItems.setProps operation
	int nID = Inst.Str2ID("op.contentItems.setProps", false);
	PDFXEdit.IOperation pOp = Inst.CreateOp(nID);
	var input = pOp.Params.Root["Input"];
	input.Add().v = Doc.CoreDoc;
	PDFXEdit.ICabNode options = pOp.Params.Root["Options"];
	int nSelID = Inst.Str2ID("selection.contentItems", false);
	uint nPage = 0; //Page number that will have it's content items modified
					//First we need to create content items selection
					//PDFXEdit.IPXV_ContentItemsSelection itSel = (PDFXEdit.IPXV_ContentItemsSelection)Doc.CreateStdSel((uint)nSelID);
					//Then we need to get root item entry for the desired page (we'll create it if needed)

	PDFXEdit.IPXV_ContentItemEntry itRootEntry = null;//Inst.CreateCIEntry();
	PDFXEdit.IPXV_ContentItemEntry itPageEntry = itRootEntry.Insert(nPage);
	//Inserting needed content items from the page
	var content = Doc.CoreDoc.Pages[nPage].GetContent(PDFXEdit.PXC_ContentAccessMode.CAccessMode_WeakClone);
	for (uint i = 0; i < content.Items.Count; i++)
	{
		//For example we will take all of the text items
		if (content.Items[i].Type == PDFXEdit.PXC_CIType.CIT_Text)
			itPageEntry.Insert(i);
	}
	//Adding selected page's root entry with added content items to the operation
	options["Entries"].Add(PDFXEdit.CabDataTypeID.dt_IUnknown).v = itPageEntry;
	//Setting the color (note that rgb notation is rgb(r,g,b) where r g b are float values from 0.0 to 1.0)
	options["FColor"].v = "#AC3312";
	//Setting mask that will tell the operation that the FColor will be modified
	options["Mask"].v = 2;
	pOp.Do();
	//Clearing the selection
	//itSel.Clear();
}